jdk8-mips64-public/hotspot: src/share/vm/jfr/leakprofiler/chains/rootSetClosure.cpp@8e875c964f41

8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg

     1 /*

     2  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "classfile/classLoaderData.hpp"

    27 #include "classfile/systemDictionary.hpp"

    28 #include "jfr/leakprofiler/chains/bfsClosure.hpp"

    29 #include "jfr/leakprofiler/chains/dfsClosure.hpp"

    30 #include "jfr/leakprofiler/chains/edgeQueue.hpp"

    31 #include "jfr/leakprofiler/chains/rootSetClosure.hpp"

    32 #include "jfr/leakprofiler/utilities/saveRestore.hpp"

    33 #include "jfr/leakprofiler/utilities/unifiedOop.hpp"

    34 #include "memory/universe.hpp"

    35 #include "oops/oop.inline.hpp"

    36 #include "prims/jvmtiExport.hpp"

    37 #include "runtime/jniHandles.hpp"

    38 #include "runtime/synchronizer.hpp"

    39 #include "runtime/thread.hpp"

    40 #include "services/management.hpp"

    41 #include "utilities/align.hpp"

    43 template <typename Delegate>

    44 RootSetClosure<Delegate>::RootSetClosure(Delegate* delegate) : _delegate(delegate) {}

    46 template <typename Delegate>

    47 void RootSetClosure<Delegate>::do_oop(oop* ref) {

    48   assert(ref != NULL, "invariant");

    49   // We discard unaligned root references because

    50   // our reference tagging scheme will use

    51   // the lowest bit in a represented reference

    52   // to indicate the reference is narrow.

    53   // It is mainly roots delivered via nmethods::do_oops()

    54   // that come in unaligned. It should be ok to duck these

    55   // since they are supposedly weak.

    56   if (!is_aligned(ref, HeapWordSize)) {

    57     return;

    58   }

    60   assert(is_aligned(ref, HeapWordSize), "invariant");

    61   if (*ref != NULL) {

    62     _delegate->do_root(ref);

    63   }

    64 }

    66 template <typename Delegate>

    67 void RootSetClosure<Delegate>::do_oop(narrowOop* ref) {

    68   assert(ref != NULL, "invariant");

    69   assert(is_aligned(ref, sizeof(narrowOop)), "invariant");

    70   const oop pointee = oopDesc::load_decode_heap_oop(ref);

    71   if (pointee != NULL) {

    72     _delegate->do_root(UnifiedOop::encode(ref));

    73   }

    74 }

    76 class RootSetClosureMarkScope : public MarkingCodeBlobClosure::MarkScope {};

    78 template <typename Delegate>

    79 void RootSetClosure<Delegate>::process() {

    80   RootSetClosureMarkScope mark_scope;

    81   CLDToOopClosure cldt_closure(this);

    82   ClassLoaderDataGraph::always_strong_cld_do(&cldt_closure);

    83   CodeBlobToOopClosure blobs(this, false);

    84   Threads::oops_do(this, NULL, &blobs); // XXX set CLDClosure to NULL

    85   ObjectSynchronizer::oops_do(this);

    86   Universe::oops_do(this);

    87   JNIHandles::oops_do(this);

    88   JvmtiExport::oops_do(this);

    89   SystemDictionary::oops_do(this);

    90   Management::oops_do(this);

    91   StringTable::oops_do(this);

    92 }

    94 template class RootSetClosure<BFSClosure>;

    95 template class RootSetClosure<DFSClosure>;

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